668272860 has 36 divisors (see below), whose sum is σ = 2027094888. Its totient is φ = 178206048.

The previous prime is 668272853. The next prime is 668272903. The reversal of 668272860 is 68272866.

It is a happy number.

668272860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1856134 + ... + 1856493.

Almost surely, 2^668272860 is an apocalyptic number.

668272860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668272860 is an abundant number, since it is smaller than the sum of its proper divisors (1358822028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668272860 is a wasteful number, since it uses less digits than its factorization.

668272860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712642 (or 3712637 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 668272860 is about 25850.9740628859. The cubic root of 668272860 is about 874.2814716204.

The spelling of 668272860 in words is "six hundred sixty-eight million, two hundred seventy-two thousand, eight hundred sixty".